CVE-2026-88049

MEDIUMNVD 5.55.5
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 5.5 under NVD CVSS v3. EPSS exploit probability: 0.1% (4th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Elevated

Also known asEUVD-2026-75592 (ENISA EUVD)Source: ENISA EUVD

5.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (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: 0.1%CVSS: 5.5Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

Tesseract is an open source OCR engine. In version 5.5.3 and earlier, prior .traineddata hardening added bounds checks to NetworkIO::CopyTimeStepGeneral and NetworkIO::Randomize in src/lstm/networkio.cpp but left NetworkIO::WriteTimeStepPart and NetworkIO::AddTimeStepPart unchecked. In LSTM::Forward in src/lstm/lstm.cpp, source_ is sized from the independently deserialized na_ field while the WriteTimeStepPart count is ns_, which comes from the CI gate WeightMatrix dim1() value. A crafted NT_LSTM layer can make ns_ much larger than na_, causing a heap out-of-bounds write during the first recognition step on the default LSTM engine and resulting in heap corruption, a crash, or potentially controlled corruption. No fixed release is available as of this review.

CVSS v3
5.5
EG Score
5.5MEDIUMmedium confidence
EG Risk
41
EG Risk 41/100

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)
Severity55% × 45%
Impact severity (EG Severity): CVSS 5.5 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, Track* at medium and Attend at high mission impact.
Exploitation public PoC (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.1%
EPSS %ILE
4th
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 (5.5): severity, escalated by confirmed exploitation. This CVE's 5.5 is its impact severity (EG Severity), not escalated.

EG Severity
5.5 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.1% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). 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, Track* at medium and Attend at high mission impact.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, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (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

September 10, 2026

Last Modified

September 14, 2026

Advisory Details (2)

Auto-updated Sep 10, 2026
Patch available. Sources: github, github_commit.
GitHub commit

commit b494ac18925f (tesseract-ocr/tesseract)

Fix landed in tesseract-ocr/tesseract commit b494ac18925f — awaiting tagged release

https://github.com/tesseract-ocr/tesseract/commit/b494ac18925f9d9aff9ef5815475de9943ab19bf
GitHub advisoryMentions a patch (unverified)

Heap out-of-bounds write in LSTM::Forward via na_/gate-matrix dimension mismatch · Advisory · tesseract-ocr/tesseract · GitHub

https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-jgq8-pprg-vc68

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntutesseract-ocr-all (4.1.1-2ubuntu0.1~esm1) @ focal2026-10-10ubuntu

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

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
tesseract5.3.0-2 ... 5.5.0-1.1 (9 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
tesseract5.5.0-1, 5.5.0-1.1
  • every version on: no fix on record
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
tesseract5.5.0-1, 5.5.0-1.1
  • every version on: no fix on record
—

Weakness Classification(1)

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

All Vendor Advisories

(1)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 7× in last 7d / 45× 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.

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. 1 repeat row among the latest 89 is merged into the row it repeats.

  1. 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  2. 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  3. 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  4. 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  5. 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  6. 2026-10-27 10:25 UTCOSV refresh
  7. 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  8. 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  9. 2026-10-25 13:53 UTCEG score recompute
  10. 2026-10-24 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  11. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  12. 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  13. 2026-10-21 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  14. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  15. 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  16. 2026-10-18 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  17. 2026-10-18 03:03 UTCEG score recompute
  18. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  19. 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  20. 2026-10-15 16:33 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  21. 2026-10-14 16:34 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  22. 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  23. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  24. 2026-10-12 16:13 UTCEG score recompute
  25. 2026-10-12 14:49 UTCEG score recompute
Show 63 more
  1. 2026-10-11 19:15 UTCEG score recompute
  2. 2026-10-11 16:32 UTCEG score recompute
  3. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  4. 2026-10-11 13:49 UTCEG score recompute
  5. 2026-10-10 20:53 UTCEG score recompute
  6. 2026-10-10 20:53 UTCVendor advisory
  7. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  8. 2026-10-09 22:21 UTCEG score recompute
  9. 2026-10-09 22:21 UTCVendor advisory
  10. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  11. 2026-10-08 23:47 UTCEG score recompute
  12. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  13. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  14. 2026-10-06 17:27 UTCEG score recompute
  15. 2026-10-06 17:27 UTCVendor advisory
  16. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  17. 2026-10-05 18:56 UTCEG score recompute
  18. 2026-10-05 17:44 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  19. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  20. 2026-10-03 21:26 UTCEG score recompute
  21. 2026-10-02 22:56 UTCEG score recompute
  22. 2026-10-02 00:23 UTCEG score recompute
  23. 2026-10-01 19:51 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  24. 2026-10-01 00:48 UTCEG score recompute
  25. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  26. 2026-09-30 01:55 UTCEG score recompute
  27. 2026-09-29 02:02 UTCEG score recompute
  28. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  29. 2026-09-28 03:31 UTCEG score recompute
  30. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  31. 2026-09-27 05:01 UTCEG score recompute
  32. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  33. 2026-09-26 06:25 UTCEG score recompute
  34. 2026-09-25 07:53 UTCEG score recompute
  35. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.1% · 3rd percentile
  36. 2026-09-24 09:23 UTCEG score recompute
  37. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  38. 2026-09-23 10:53 UTCEG score recompute
  39. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  40. 2026-09-22 12:23 UTCEG score recompute
  41. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  42. 2026-09-21 13:52 UTCEG score recompute
  43. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  44. 2026-09-19 16:48 UTCEG score recompute
  45. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  46. 2026-09-17 19:47 UTCEG score recompute
  47. 2026-09-17 19:32 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  48. 2026-09-16 18:09 UTCEG score recompute
  49. 2026-09-16 14:09 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  50. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · 4th percentile
  51. 2026-09-15 18:45 UTCEG score recompute
  52. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  53. 2026-09-14 20:14 UTCEG score recompute▼ 3.10
  54. 2026-09-14 20:13 UTCNVD updateCVSS v3 → 5.5 · severity → MEDIUM
  55. 2026-09-14 02:58 UTCEG score recompute
  56. 2026-09-13 16:48 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  57. 2026-09-13 00:39 UTCEG score recompute
  58. 2026-09-12 15:02 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  59. 2026-09-11 22:20 UTCEG score recompute
  60. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 8th percentile
  61. 2026-09-10 17:19 UTCEG score recompute
  62. 2026-09-10 16:35 UTCEG score recomputeFirst assessed: 8.6 HIGH
  63. 2026-09-10 16:34 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-88049?
CVE-2026-88049 is a medium-severity vulnerability; its CVE record was published on September 10, 2026. Tesseract is an open source OCR engine. In version 5.5.3 and earlier, prior .traineddata hardening added bounds checks to NetworkIO::CopyTimeStepGeneral and NetworkIO::Randomize in src/lstm/networkio.cpp but left NetworkIO::WriteTimeStepPart and NetworkIO::AddTimeStepPart unchecked. In…
When was the CVE record for CVE-2026-88049 published?
The CVE record for CVE-2026-88049 was published on September 10, 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 September 14, 2026; the record at its source may have been updated since.
Is CVE-2026-88049 actively exploited?
CVE-2026-88049 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (4th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-88049?
CVE-2026-88049 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-88049?
A fix for CVE-2026-88049 is available: update to the fixed version the vendor names in its advisory.

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