CVE-2016-5636: python Integer Overflow or Wraparound

Modified

AliasesRHSA-2016:2586UBUNTU-CVE-2016-5636DEBIAN-CVE-2016-5636

Published 02-09-2016Last modified 06-08-2024

Vulnerability summary

CVE-2016-5636 is a high (CVSS 10.0) Integer Overflow or Wraparound vulnerability in python. EPSS estimates a 25.48% chance of exploitation in the next 30 days, higher than 97.9% of scored vulnerabilities.

Priority

Prioritisesevere

Severe, CVSS 9.8 (NVD); no exploitation reported by the 5 checked sources; EPSS 25% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?

CVSS score

10.0/10

010

High · v2.0 (NVD)

EPSS score

25.48%

0%100%

High · 0.00 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 16 · Related 13

DLA-1663-1 DLA-522-1 MGASA-2016-0230 OPENSUSE-SU-2020:0086-1 OPENSUSE-SU-2024:10193-1 OPENSUSE-SU-2024:10450-1+10 more

Timeline

02-09-2016
PublishedVulnerability first disclosed.
06-08-2024
Last modifiedVulnerability information updated.

Description

Integer overflow in the get_data function in zipimport.c in CPython (aka Python) before 2.7.12, 3.x before 3.4.5, and 3.5.x before 3.5.2 allows remote attackers to have unspecified impact via a negative data size value, which triggers a heap-based buffer overflow.

CVSS metrics

5 scores · 4 sources · 2 versions

v3.09.8v2.010.0

EPSS trend

Probability

25.48%

Chance of exploitation in the next 30 days

Percentile

98%

Versus all other CVEs

30-day change

No change 0.00 pp

From 25.48% on 04-10-2026

04-10-202603-11-2026

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

CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Redhat8 products

python< 0:2.7.5-48.el7
python-debug< 0:2.7.5-48.el7
python-debuginfo< 0:2.7.5-48.el7
python-devel< 0:2.7.5-48.el7
python-libs< 0:2.7.5-48.el7

Show all 8

Ubuntu3 products

python2.7< 2.7.6-8ubuntu0.3 | < 2.7.12-1ubuntu0~16.04.1
python3.4< 3.4.3-1ubuntu1~14.04.5
python3.5< 3.5.2-2ubuntu0~16.04.4~14.04.1 | < 3.5.2-2ubuntu0~16.04.1

Debian1 product

python2.7< 2.7.12~rc1-1

Python1 product

pythonEOL3.0 | 3.0.1 | 3.1.0 | 3.1.1 | 3.1.2 | 3.1.3 | 3.1.4 | 3.1.5 | 3.2.0 | 3.2.1 | 3.2.2 | 3.2.3 | 3.2.4 | 3.2.5 | 3.2.6 | 3.3.0 | 3.3.1 | 3.3.2 | 3.3.3 | 3.3.4 | 3.3.5 | 3.3.6 | 3.4.0 | 3.4.1 | 3.4.2 | 3.4.3 | 3.4.4 | ≤ 2.7.11 | 3.5.0 | 3.5.1

4 vendors · 13 products