CVE-2026-53496

MEDIUMPre-NVD 5.35.3
EchelonGraph scoreMEDIUM confidence

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

This medium-severity CVE scores 5.3 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.5% (42nd percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Elevated

Also known asEUVD-2026-77628 (ENISA EUVD) · GHSA-g77h-45rf-hcx4 (GitHub Security Advisories)Source: ENISA EUVD

5.3EG
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: 0.5%CVSS: 5.3Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

ExifReader is a JavaScript Exif information parser. Prior to 4.40.1, ExifReader.load() and the asynchronous file and URL loaders can pass attacker-supplied HEIC or AVIF data to the ISO-BMFF parser in src/image-header-iso-bmff.js, where findMetaBox() and parseBox() accept an eight-byte box header without confirming that fields required by the parsed box remain in the DataView. A valid ftyp box followed by an empty free or unknown box can cause an unchecked full-box version read, while a truncated extended-size box can make getBoxLength() and hasEmptyHighBits() read absent size fields. The resulting RangeError escapes the main parsing path and can abort an application request or worker when parse errors are not defensively caught, causing denial of service. This issue is fixed in version 4.40.1.

CVSS v3
5.3
EG Score
5.3MEDIUMmedium confidence
EG Risk
55
EG Risk 55/100

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)
Severity53% × 45%
Impact severity (EG Severity): CVSS 5.3 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.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.5%
EPSS %ILE
42nd
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 (5.3): severity, escalated by confirmed exploitation. This CVE's 5.3 is its impact severity (EG Severity), not escalated.

EG Severity
5.3 MEDIUMCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.a secondary CVSS source · CVSS v3.0 or v3.1
EG Likelihood
0.5% 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 or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

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

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 yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

July 17, 2026

Last Modified

September 30, 2026

Advisory Details (3)

Auto-updated Sep 14, 2026
Patch available. Sources: github, github_commit, github_release.
GitHub release Patch Available

4.40.1: Robustness fixes for malformed and truncated input

Patch available: mattiasw/ExifReader v4.40.1

https://github.com/mattiasw/ExifReader/releases/tag/v4.40.1
GitHub commit Patch Available

commit 00878ca9df0e (mattiasw/ExifReader)

Patch available: mattiasw/ExifReader v4.40.1 (contains commit 00878ca9df0e)

https://github.com/mattiasw/ExifReader/commit/00878ca9df0e26480dda7a931c888048c9f7be45
GitHub advisoryMentions a patch (unverified)

ExifReader HEIC/AVIF ISO-BMFF parser throws uncaught RangeError on truncated boxes · Advisory · mattiasw/ExifReader · GitHub

https://github.com/mattiasw/ExifReader/security/advisories/GHSA-g77h-45rf-hcx4

Vendor Advisories for CVE-2026-53496(1)

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

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
exifreader—
  • every version up to 4.40.1: fixed in 4.40.1
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 37× 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. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  2. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  3. 2026-10-25 14:20 UTCEG score recompute
  4. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  5. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  6. 2026-10-22 21:49 UTCEG score recompute
  7. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  8. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  9. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.5% · 42nd percentile
  10. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  11. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  12. 2026-10-18 03:31 UTCEG score recompute
  13. 2026-10-17 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  14. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  15. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  16. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  17. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  18. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  19. 2026-10-12 15:57 UTCEG score recompute
  20. 2026-10-11 19:40 UTCEG score recompute
  21. 2026-10-11 16:55 UTCEG score recompute
  22. 2026-10-11 14:19 UTCEG score recompute
  23. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  24. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  25. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.5% · 41st percentile
Show 30 more
  1. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  2. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  3. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  4. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  5. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  6. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  7. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.5% · 41st percentile
  8. 2026-09-30 19:43 UTCEG score recompute
  9. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  10. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  11. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  12. 2026-09-28 07:50 UTCEG score recompute
  13. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  14. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  15. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.5% · 40th percentile
  16. 2026-09-24 04:28 UTCEG score recompute
  17. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  18. 2026-09-23 02:24 UTCEG score recompute
  19. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  20. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  21. 2026-09-17 10:14 UTCEG score recompute
  22. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  23. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.5% · 38th percentile
  24. 2026-09-14 19:23 UTCEG score recompute
  25. 2026-09-14 18:55 UTCEG score recompute
  26. 2026-09-14 18:08 UTCEG score recompute
  27. 2026-07-30 19:16 UTCEG score recompute
  28. 2026-07-26 11:17 UTCEG score recompute
  29. 2026-07-23 03:19 UTCEG score recompute
  30. 2026-07-17 21:00 UTCEG score recompute

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-53496?
CVE-2026-53496 is a medium-severity vulnerability; its CVE record was published on July 17, 2026. ExifReader is a JavaScript Exif information parser. Prior to 4.40.1, ExifReader.load() and the asynchronous file and URL loaders can pass attacker-supplied HEIC or AVIF data to the ISO-BMFF parser in src/image-header-iso-bmff.js, where findMetaBox() and parseBox() accept an eight-byte box header…
When was the CVE record for CVE-2026-53496 published?
The CVE record for CVE-2026-53496 was published on July 17, 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 30, 2026; the record at its source may have been updated since.
Is CVE-2026-53496 actively exploited?
CVE-2026-53496 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (42nd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-53496?
CVE-2026-53496 has a CVSS base score of 5.3 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-53496?
A fix for CVE-2026-53496 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-53496 are linked in the Vendor Advisories panel on this page.

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