CVE-2026-107161

HIGHPre-NVD 7.57.5
EchelonGraph scoreHIGH confidence

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

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-10-07. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 4 sources updated this week

Also known asEUVD-2026-94582 (ENISA EUVD) · GHSA-4jhc-cc62-fwcm (GitHub Security Advisories)Source: ENISA EUVD

7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A heap-based buffer overflow flaw was found in Cyrus SASL. The add_to_challenge() function in the DIGEST-MD5 plugin computes the size of the buffer needed for a challenge/response field before DIGEST-MD5 quoting is applied, but does not recompute that size when quoting (escaping special characters) makes the value longer. The under-sized buffer is then passed to strcat(), causing a heap-based out-of-bounds write whose size depends on attacker-controlled input. A malicious or on-path DIGEST-MD5 (or HTTP Digest) server can trigger this flaw in a connecting client by supplying a crafted challenge field, such as realm or nonce, most likely resulting in a crash of the client application.

CVSS v3
7.5
EG Score
7.5HIGHhigh confidence
EG Risk
34
EG Risk 34/100

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)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
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 none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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
0.4%
EPSS %ILE
31st
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 (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.

EG Severity
7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS. 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: 14 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 none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (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)14 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 total (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

October 7, 2026

Last Modified

October 30, 2026

Advisory Details (2)

Auto-updated Oct 7, 2026
Patch available. Sources: redhat.
Red Hat

2460420 – (CVE-2026-107161) CVE-2026-107161 cyrus-sasl: Heap buffer overflow in cyrus-sasl add_to_challenge() allows malicious server to crash or compromise DIGEST-MD5 clients

https://bugzilla.redhat.com/show_bug.cgi?id=2460420
Red HatMentions a patch (unverified)

CVE-2026-107161 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-107161

Vendor Advisories for CVE-2026-107161(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
cyrus-sasl22.1.28+dfsg-10 ... 2.1.28+dfsg1-9 (13 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
cyrus-sasl22.1.28+dfsg1-10, 2.1.28+dfsg1-11, 2.1.28+dfsg1-9
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
cyrus-sasl22.1.28+dfsg1-10, 2.1.28+dfsg1-11, 2.1.28+dfsg1-9
  • every version on: no fix on record
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 22× in last 7d / 77× 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.

  1. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  2. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.4% · 31st percentile
  3. 2026-10-30 22:26 UTCEG score recompute
  4. 2026-10-30 22:26 UTCVendor advisory
  5. 2026-10-30 22:26 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  6. 2026-10-30 22:15 UTCEG score recompute
  7. 2026-10-30 22:15 UTCVendor advisory
  8. 2026-10-30 22:15 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  9. 2026-10-30 21:26 UTCEG score recompute
  10. 2026-10-30 21:26 UTCVendor advisory
  11. 2026-10-30 21:26 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  12. 2026-10-30 21:14 UTCEG score recompute
  13. 2026-10-30 21:14 UTCVendor advisory
  14. 2026-10-30 21:14 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  15. 2026-10-30 16:44 UTCEG score recompute
  16. 2026-10-30 16:44 UTCVendor advisory
  17. 2026-10-30 16:44 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  18. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  19. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  20. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.3% · 27th percentile
  21. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  22. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  23. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.3% · 26th percentile
  24. 2026-10-25 14:54 UTCEG score recompute
  25. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.3% · 19th percentile
Show 52 more
  1. 2026-10-24 06:04 UTCEG score recompute
  2. 2026-10-24 06:04 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  3. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  4. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  5. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.3% · 19th percentile
  6. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  7. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  8. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  9. 2026-10-18 05:07 UTCEG score recompute
  10. 2026-10-17 19:21 UTCEG score recompute
  11. 2026-10-17 19:21 UTCVendor advisory
  12. 2026-10-17 19:21 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  13. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  14. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  15. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  16. 2026-10-14 16:32 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  17. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  18. 2026-10-12 16:39 UTCEG score recompute
  19. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  20. 2026-10-12 02:27 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  21. 2026-10-11 20:14 UTCEG score recompute
  22. 2026-10-11 18:26 UTCEG score recompute
  23. 2026-10-11 14:41 UTCEG score recompute
  24. 2026-10-11 14:41 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  25. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  26. 2026-10-11 02:56 UTCEG score recompute
  27. 2026-10-11 02:56 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  28. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.3% · 18th percentile
  29. 2026-10-10 15:07 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  30. 2026-10-10 03:21 UTCEG score recompute
  31. 2026-10-10 03:21 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  32. 2026-10-10 03:00 UTCEG score recompute
  33. 2026-10-10 03:00 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  34. 2026-10-09 23:24 UTCEG score recompute
  35. 2026-10-09 23:23 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  36. 2026-10-09 22:21 UTCEG score recompute
  37. 2026-10-09 22:20 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  38. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  39. 2026-10-09 14:03 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  40. 2026-10-09 02:18 UTCEG score recompute
  41. 2026-10-09 02:18 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  42. 2026-10-09 01:28 UTCEG score recompute
  43. 2026-10-09 01:28 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  44. 2026-10-08 21:01 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  45. 2026-10-08 19:55 UTCEG score recompute
  46. 2026-10-08 19:55 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  47. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.2% · 13th percentile
  48. 2026-10-08 08:08 UTCEG score recompute
  49. 2026-10-08 08:08 UTCGHSA enrichmentGHSA-4jhc-cc62-fwcm · GitHub severity HIGH · GitHub CVSS 7.5
  50. 2026-10-07 20:22 UTCEG score recompute
  51. 2026-10-07 19:43 UTCEG score recomputeFirst assessed: 7.5 HIGH
  52. 2026-10-07 19:41 UTCMITRE cvelistV5first tracked

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-107161?
CVE-2026-107161 is a high-severity vulnerability; its CVE record was published on October 7, 2026. A heap-based buffer overflow flaw was found in Cyrus SASL. The add_to_challenge() function in the DIGEST-MD5 plugin computes the size of the buffer needed for a challenge/response field before DIGEST-MD5 quoting is applied, but does not recompute that size when quoting (escaping special characters)…
When was CVE-2026-107161 made public?
CVE-2026-107161 was made public on October 7, 2026: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on October 7, 2026. EchelonGraph's copy of the record carries a last-modified date of October 30, 2026; the record at its source may have been updated since.
Is CVE-2026-107161 actively exploited?
CVE-2026-107161 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (31st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-107161?
CVE-2026-107161 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-107161?
A fix for CVE-2026-107161 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-107161 are linked in the Vendor Advisories panel on this page.

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