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CVE-2026-103995: Lenient parsing of integers for response body and chunk framing

Awaiting analysis
AliasesCGA-2qh6-r99g-mcx2CGA-36h5-wjgw-j5x6CGA-4jf6-rmh4-vqjj
Published 27-10-2026Last modified 28-10-2026

Vulnerability summary

CVE-2026-103995 is a low (CVSS 2.0) vulnerability in python software foundation cpython. EPSS estimates a 0.36% chance of exploitation in the next 30 days, higher than 29.8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 2, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
2.0/10
010
Low · v4.0 (CVE.org)
EPSS score
0.36%
0%100%
Low · Change unavailable
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 27-10-2026
    PublishedVulnerability first disclosed.
  2. 28-10-2026
    Last modifiedVulnerability information updated.

Description

Response body and chunk parsing would handle non-hex or negative integers incorrectly which could result in misinterpreting HTTP response contents.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.36%

Chance of exploitation in the next 30 days

Percentile

30%

Versus all other CVEs

30-day change

Change unavailable

Change unavailable

28-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, administrative account, user interaction (CVSS vector). Other conditions: not stated in public data.

Chainguard6 products
  • python-3.10All versions (No fix recorded)
  • python-3.11All versions (No fix recorded)
  • python-3.12All versions (No fix recorded)
  • python-3.13All versions (No fix recorded)
  • python-3.14All versions (No fix recorded)
Wolfi6 products
  • python-3.10All versions (No fix recorded)
  • python-3.11All versions (No fix recorded)
  • python-3.12All versions (No fix recorded)
  • python-3.13All versions (No fix recorded)
  • python-3.14All versions (No fix recorded)
Python software foundation1 product

3 vendors · 13 products

References

7 links