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NVD / CVE Program· CNA GitHub_M

CVE-2026-88047: Tesseract: ReadNormProtos stack buffer overflow

HighCVSS 8.6 · v4.0—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 34/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.11% (FIRST EPSS).
  • Someone with local access to the system can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: tesseract (AlmaLinux:10) 5.3.4-11.el10_2; tesseract-devel (AlmaLinux:10) 5.3.4-11.el10_2; tesseract (AlmaLinux:8) 4.1.1-7.el8_10.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to tesseract (AlmaLinux:10) 5.3.4-11.el10_2; tesseract-devel (AlmaLinux:10) 5.3.4-11.el10_2; tesseract (AlmaLinux:8) 4.1.1-7.el8_10 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Tesseract is an open source OCR engine. In version 5.5.3 and earlier, Classify::ReadNormProtos in src/classify/normmatch.cpp parses the NORMPROTO component of a .traineddata file and uses std::istream::operator>>(char*) to extract a whitespace-delimited token into a fixed 61-byte stack buffer without setting a stream width. The 100-byte line buffer can carry a token of up to 99 characters, so a token longer than 60 characters writes up to 39 attacker-controlled bytes past the buffer during TessBaseAPI::Init of the legacy engine, causing stack corruption, denial of service, and potentially control-flow hijacking on affected standard-library implementations. Builds using Apple's libc++ C++20 bounded array overload are incidentally protected, while typical libstdc++ builds remain affected. No fixed release is available as of this review.

Published
Sep 10, 2026
Updated
Sep 14, 2026
EPSS
0.1% · 1th percentile

Report tools

JSON

Action score

34

Monitor

Low priority for now.

CVSS
34 / 40 · 8.6 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · GitHub_M
8.6
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-88047

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
tesseract-ocrtesseract ocr

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • tesseract-ocr tesseract

    • <= 5.5.3affected

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • tesseract-ocr tesseract ocrup to 5.5.3 inclusive

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:10tesseractbefore 5.3.4-11.el10_25.3.4-11.el10_2
AlmaLinux:10tesseract-develbefore 5.3.4-11.el10_25.3.4-11.el10_2
AlmaLinux:8tesseractbefore 4.1.1-7.el8_104.1.1-7.el8_10
AlmaLinux:8tesseract-develbefore 4.1.1-7.el8_104.1.1-7.el8_10
AlmaLinux:9tesseract-develbefore 4.1.1-11.el9_84.1.1-11.el9_8
Debian:12tesseractfrom 0—
openSUSE:Leap 16.0tesseract-ocrbefore 5.5.3-bp160.1.15.5.3-bp160.1.1
openSUSE:Tumbleweedtesseract-ocrbefore 5.5.3-2.15.5.3-2.1
Rocky Linux:10tesseractbefore 0:5.3.4-11.el10_20:5.3.4-11.el10_2
Rocky Linux:8tesseractbefore 0:4.1.1-7.el8_100:4.1.1-7.el8_10
Rocky Linux:9tesseractbefore 0:4.1.1-11.el9_80:4.1.1-11.el9_8

Same product

tesseract-ocr: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-88053Tesseract: Heap out-of-bounds write in Classify::ReadIntTemplates via unvalidated counts in crafted .traineddata
    34Monitor
  • CVE-2026-88051Tesseract: Heap out-of-bounds write in GenericVector<T>::read due to independent reserved/size_used_ fields
    34Monitor
  • CVE-2026-88049Tesseract: Heap out-of-bounds write in LSTM::Forward via na_/gate-matrix dimension mismatch
    34Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2011-1136Nov 13, 2019 · In tesseract 2.03 and 2.04, an attacker can rewrite an arbitrary user file by guessing the PID and creating a link to the user's file.
    18Monitor
  • ← EarlierCVE-2021-36081Jun 30, 2021 · Tesseract OCR 5.0.0-alpha-20201231 has a one_ell_conflict use-after-free during a strpbrk call.
    31Monitor
  • Later →CVE-2026-88048Sep 10, 2026 · Tesseract: Heap out-of-bounds write/read in FullyConnected::Forward via layer/weight-matrix dimension mismatch
    34Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
almalinux:tesseract5.3.4-11.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:tesseract-devel4.1.1-11.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:tesseract-devel5.3.4-11.el10_2 · AlmaLinux:10Package registry (OSV)
opensuse:tesseract-ocr5.5.3-2.1 · openSUSE:TumbleweedPackage registry (OSV)
rocky linux:tesseract0:5.3.4-11.el10_2 · Rocky Linux:10Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Not on record for this CVE: researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Local
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-121 · Stack-based Buffer Overflow

CVSS vector

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (1 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records