CVE-2026-34352

CRITICALNVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 0.3% (16th percentile of EPSS-scored CVEs). GitHub Security Advisory CVSS 8.5 is lower than this score; a lower GitHub score revises it only when its advisory is newer than the CVE record's last change, and this advisory (published 2026-03-27) is not newer than that change (2026-06-17), so it does not.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this weekElevated

Also known asEUVD-2026-16468 (ENISA EUVD) · GHSA-4vj5-vh2w-8g5j (GitHub Security Advisories)Source: ENISA EUVD

9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 9.8Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

In TigerVNC before 1.16.2, Image.cxx in x0vncserver allows other users to observe or manipulate the screen contents, or cause an application crash, because of incorrect permissions.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
60
EG Risk 60/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity98% × 45%
Impact severity (EG Severity): CVSS 9.8 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
16th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (9.8): severity, escalated by confirmed exploitation. This CVE's 9.8 is its impact severity (EG Severity), not escalated.

EG Severity
9.8 CRITICALCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.3% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-01). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation public PoC (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

March 26, 2026

Last Modified

June 17, 2026

Advisory Details (5)

Auto-updated Oct 31, 2026
Patch available. Sources: github_commit.
Web page

[BUG] x0vncserver uses 0777 permissions for framebuffer shared memory · Issue #2079 · TigerVNC/tigervnc · GitHub

https://github.com/TigerVNC/tigervnc/issues/2079
Web page

oss-security - TigerVNC 1.16.2 security release

https://www.openwall.com/lists/oss-security/2026/03/26/7
Web page

TigerVNC - Browse /stable/1.16.2 at SourceForge.net

https://sourceforge.net/projects/tigervnc/files/stable/1.16.2
GitHub commit

commit 0b5cab169d84 (TigerVNC/tigervnc)

Fix landed in TigerVNC/tigervnc commit 0b5cab169d84 — awaiting tagged release

https://github.com/TigerVNC/tigervnc/commit/0b5cab169d847789efa54459a87659d3fd484393

Patch Availability(12)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhattigervnc-0:1.12.0-6.el8_6.172026-06-08redhat
redhattigervnc-0:1.12.0-15.el8_8.172026-06-04redhat
redhattigervnc-0:1.1.0-25.el6_10.162026-06-04redhat
redhattigervnc-0:1.11.0-8.el8_4.152026-06-04redhat
redhattigervnc-0:1.14.1-10.el9_62026-06-02redhat
redhattigervnc-0:1.8.0-36.el7_9.42026-06-02redhat
redhattigervnc-0:1.11.0-22.el9_0.172026-05-28redhat
redhattigervnc-0:1.12.0-14.el9_2.142026-05-26redhat
redhattigervnc-0:1.13.1-8.el9_4.92026-05-26redhat
redhattigervnc-0:1.15.0-7.el9_8.12026-05-19redhat
redhattigervnc-0:1.15.0-9.el8_102026-05-04redhat
redhattigervnc-0:1.15.0-6.el9_7.12026-04-27redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
tigervnc1.11.0+dfsg-2 ... 1.15.0+dfsg-2.1~deb13u1 (19 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
tigervnc1.12.0+dfsg-8 ... 1.15.0+dfsg-2.1~deb13u1 (9 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
tigervnc1.15.0+dfsg-2
  • every version up to 1.15.0+dfsg-2.1~deb13u1: fixed in 1.15.0+dfsg-2.1~deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
tigervnc1.15.0+dfsg-2, 1.15.0+dfsg-2.1~deb13u1
  • every version up to 1.15.0+dfsg-2.1: fixed in 1.15.0+dfsg-2.1
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 27× in last 7d / 98× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 363 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 263 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-01 19:29 UTCEG score recompute
  2. 2026-11-01 19:29 UTCVendor advisory
  3. 2026-11-01 19:29 UTCGHSA enrichmentGHSA-4vj5-vh2w-8g5j · GitHub severity HIGH · GitHub CVSS 8.5
  4. 2026-11-01 16:34 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  5. 2026-10-31 19:35 UTCEG score recompute
  6. 2026-10-31 19:35 UTCVendor advisory
  7. 2026-10-31 19:35 UTCGHSA enrichmentGHSA-4vj5-vh2w-8g5j · GitHub severity HIGH · GitHub CVSS 8.5
  8. 2026-10-30 19:42 UTCEG score recompute
  9. 2026-10-30 19:42 UTCVendor advisory
  10. 2026-10-30 19:42 UTCGHSA enrichmentGHSA-4vj5-vh2w-8g5j · GitHub severity HIGH · GitHub CVSS 8.5
  11. 2026-10-30 16:34 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  12. 2026-10-29 19:46 UTCEG score recompute
  13. 2026-10-29 19:46 UTCVendor advisory
  14. 2026-10-29 19:46 UTCGHSA enrichmentGHSA-4vj5-vh2w-8g5j · GitHub severity HIGH · GitHub CVSS 8.5
  15. 2026-10-29 16:33 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  16. 2026-10-28 19:51 UTCEG score recompute
  17. 2026-10-28 19:51 UTCVendor advisory
  18. 2026-10-28 19:51 UTCGHSA enrichmentGHSA-4vj5-vh2w-8g5j · GitHub severity HIGH · GitHub CVSS 8.5
  19. 2026-10-28 16:32 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  20. 2026-10-27 19:58 UTCEG score recompute
  21. 2026-10-27 19:58 UTCVendor advisory
  22. 2026-10-27 19:58 UTCGHSA enrichmentGHSA-4vj5-vh2w-8g5j · GitHub severity HIGH · GitHub CVSS 8.5
  23. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  24. 2026-10-26 20:04 UTCEG score recompute
  25. 2026-10-26 20:04 UTCVendor advisory
Show 75 more
  1. 2026-10-26 20:04 UTCGHSA enrichmentGHSA-4vj5-vh2w-8g5j · GitHub severity HIGH · GitHub CVSS 8.5
  2. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  3. 2026-10-25 18:13 UTCEG score recompute
  4. 2026-10-25 18:13 UTCVendor advisory
  5. 2026-10-25 18:13 UTCGHSA enrichmentGHSA-4vj5-vh2w-8g5j · GitHub severity HIGH · GitHub CVSS 8.5
  6. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.3% · 16th percentile
  7. 2026-10-25 14:34 UTCEG score recompute
  8. 2026-10-24 18:12 UTCEG score recompute
  9. 2026-10-24 18:12 UTCVendor advisory
  10. 2026-10-24 18:12 UTCGHSA enrichmentGHSA-4vj5-vh2w-8g5j · GitHub severity HIGH · GitHub CVSS 8.5
  11. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  12. 2026-10-23 18:17 UTCEG score recompute
  13. 2026-10-23 18:17 UTCVendor advisory
  14. 2026-10-23 18:17 UTCGHSA enrichmentGHSA-4vj5-vh2w-8g5j · GitHub severity HIGH · GitHub CVSS 8.5
  15. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  16. 2026-10-22 18:22 UTCEG score recompute
  17. 2026-10-22 18:22 UTCVendor advisory
  18. 2026-10-22 18:22 UTCGHSA enrichmentGHSA-4vj5-vh2w-8g5j · GitHub severity HIGH · GitHub CVSS 8.5
  19. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  20. 2026-10-21 18:27 UTCEG score recompute
  21. 2026-10-21 18:27 UTCVendor advisory
  22. 2026-10-21 18:27 UTCGHSA enrichmentGHSA-4vj5-vh2w-8g5j · GitHub severity HIGH · GitHub CVSS 8.5
  23. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  24. 2026-10-20 18:33 UTCEG score recompute
  25. 2026-10-20 18:33 UTCVendor advisory
  26. 2026-10-20 18:33 UTCGHSA enrichmentGHSA-4vj5-vh2w-8g5j · GitHub severity HIGH · GitHub CVSS 8.5
  27. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  28. 2026-10-19 18:38 UTCEG score recompute
  29. 2026-10-19 18:38 UTCVendor advisory
  30. 2026-10-19 18:38 UTCGHSA enrichmentGHSA-4vj5-vh2w-8g5j · GitHub severity HIGH · GitHub CVSS 8.5
  31. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  32. 2026-10-18 18:41 UTCEG score recompute
  33. 2026-10-18 18:41 UTCVendor advisory
  34. 2026-10-18 18:41 UTCGHSA enrichmentGHSA-4vj5-vh2w-8g5j · GitHub severity HIGH · GitHub CVSS 8.5
  35. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  36. 2026-10-18 03:46 UTCEG score recompute
  37. 2026-10-17 18:47 UTCEG score recompute
  38. 2026-10-17 18:47 UTCVendor advisory
  39. 2026-10-17 18:46 UTCGHSA enrichmentGHSA-4vj5-vh2w-8g5j · GitHub severity HIGH · GitHub CVSS 8.5
  40. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  41. 2026-10-16 18:51 UTCEG score recompute
  42. 2026-10-16 18:50 UTCVendor advisory
  43. 2026-10-16 18:50 UTCGHSA enrichmentGHSA-4vj5-vh2w-8g5j · GitHub severity HIGH · GitHub CVSS 8.5
  44. 2026-10-16 16:41 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  45. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  46. 2026-10-15 15:51 UTCEG score recompute
  47. 2026-10-15 15:51 UTCVendor advisory
  48. 2026-10-15 15:51 UTCGHSA enrichmentGHSA-4vj5-vh2w-8g5j · GitHub severity HIGH · GitHub CVSS 8.5
  49. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  50. 2026-10-14 10:03 UTCEG score recompute
  51. 2026-10-14 10:03 UTCVendor advisory
  52. 2026-10-14 10:02 UTCGHSA enrichmentGHSA-4vj5-vh2w-8g5j · GitHub severity HIGH · GitHub CVSS 8.5
  53. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  54. 2026-10-13 08:15 UTCEG score recompute
  55. 2026-10-13 08:15 UTCVendor advisory
  56. 2026-10-13 08:15 UTCGHSA enrichmentGHSA-4vj5-vh2w-8g5j · GitHub severity HIGH · GitHub CVSS 8.5
  57. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  58. 2026-10-12 16:12 UTCEG score recompute
  59. 2026-10-12 08:20 UTCVendor advisory
  60. 2026-10-12 08:19 UTCGHSA enrichmentGHSA-4vj5-vh2w-8g5j · GitHub severity HIGH · GitHub CVSS 8.5
  61. 2026-10-11 19:54 UTCEG score recompute
  62. 2026-10-11 17:08 UTCEG score recompute
  63. 2026-10-11 14:35 UTCEG score recompute
  64. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  65. 2026-10-11 04:01 UTCOSV refresh
  66. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  67. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  68. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  69. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  70. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.4% · 34th percentile
  71. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  72. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  73. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  74. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.4% · 33rd percentile
  75. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 33rd percentile

Frequently asked(5)

What is CVE-2026-34352?
CVE-2026-34352 is a critical-severity vulnerability; its CVE record was published on March 26, 2026. In TigerVNC before 1.16.2, Image.cxx in x0vncserver allows other users to observe or manipulate the screen contents, or cause an application crash, because of incorrect permissions.
When was the CVE record for CVE-2026-34352 published?
The CVE record for CVE-2026-34352 was published on March 26, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of June 17, 2026; the record at its source may have been updated since.
Is CVE-2026-34352 actively exploited?
CVE-2026-34352 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (16th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-34352?
CVE-2026-34352 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-34352?
A fix for CVE-2026-34352 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-34352 are linked in the Vendor Advisories panel on this page.

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