Security readout for executives and security teams
Plain-English summary
CVE-2021-46822 is a memory-safety flaw in libjpeg-turbo's PPM/PGM image loading path. A specially formed 16-bit PPM or PGM file can cause a heap buffer overflow when loaded through specific tjLoadImage conversions. Business urgency depends on whether systems process untrusted PPM/PGM files.
Executive priority
Handle as a dependency exposure review, not an emergency based on current evidence. Give priority to public-facing or automated image-processing systems that accept obscure image formats from users or partners.
Technical view
The issue affects libjpeg-turbo through 2.0.90. The PPM reader mishandles tjLoadImage when loading a 16-bit binary PPM into a grayscale buffer or a 16-bit binary PGM into an RGB buffer, related to get_word_rgb_row in rdppm.c. The CVE record gives no CVSS, CWE, or detailed affected CPEs.
Likely exposure
Exposure is most likely in applications, services, or tools that embed libjpeg-turbo and accept untrusted PPM or PGM image files. Systems limited to common JPEG processing only are not clearly exposed from the supplied evidence.
Exploitation context
The source bundle does not show CISA KEV listing, active exploitation, or public exploit activity. Exploitation would require a malicious 16-bit binary PPM or PGM file to reach the vulnerable libjpeg-turbo loading path.
Researcher notes
Evidence is specific but incomplete: the CVE identifies the vulnerable conversion cases and code area, but provides no CVSS, CWE, CPEs, or exploitation status. Use the referenced upstream commit and vendor/package metadata to map fixed versions.
Mitigation direction
- Inventory libjpeg-turbo usage and identify versions through 2.0.90.
- Prioritize systems that process untrusted PPM or PGM files.
- Check libjpeg-turbo or package vendor guidance for fixed releases.
- Restrict or reject untrusted 16-bit binary PPM and PGM inputs where feasible.
- Monitor image-processing services for crashes or abnormal memory failures.
Validation and detection
- Confirm whether applications call tjLoadImage for PPM or PGM inputs.
- Check installed libjpeg-turbo package versions against 2.0.90 or earlier.
- Review upload pipelines for accepted PPM and PGM file types.
- Validate vendor advisories or package changelogs before closing remediation.
- Regression-test legitimate image workflows after updating or filtering inputs.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-46822 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/libjpeg-turbo/libjpeg-turbo/commit/f35fd27ec641c42d6b115bfa595e483ec58188d2CVE reference · x_refsource_MISC
- https://exchange.xforce.ibmcloud.com/vulnerabilities/221567CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.