CVE-2015-2296: The resolve_redirects function in sessions.py in requests 2.1.0 through 2.5.3 allows remote attackers to condu

This month

MEDIUM 6.8WATCHLISTMITIGATEDOWNGRADEMITIGATE

CVE-2015-2296 is a medium-severity flaw (CVSS 6.8) affecting mageia, requests, ubuntu linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The resolve_redirects function in sessions.py in requests 2.1.0 through 2.5.3 allows remote attackers to conduct session fixation attacks via a cookie without a host value in a redirect.

Why this priority

On your watchlist

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.8 (Medium)
EPSS exploit chance	3.2% (top 12%)
CISA exploited list	No
Published	2015-03-18
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: canonical · mageia project · python

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2015-03-18 16:59 UTCPublished CVE record published
2026-06-17 00:23 UTCUpdated Record last modified

mageia project mageia MITIGATE

Affected: 4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

python requests DOWNGRADE

Affected: 2.1.0 · 2.2.1 · 2.3.0 · 2.4.0 · 2.4.1 · 2.4.2 · 2.4.3 · 2.5.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.1.0

1. Check installed version

apt-cache policy requests || rpm -q requests || requests --version

2. No fixed release: DOWNGRADE to a release before 2.1.0 (Debian / Ubuntu)

apt-cache madison requests sudo apt install requests=<VERSION_BEFORE_2.1.0> sudo apt-mark hold requests

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list requests sudo dnf downgrade requests-<VERSION_BEFORE_2.1.0> sudo dnf versionlock add requests

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

canonical ubuntu linux MITIGATE

Affected: 14.04 · 14.10

Fixed in: no fixed release known

Safe to downgrade to: a release before 14.04

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2015-2296?

mageia: mitigate or apply the listed mitigation; requests: downgrade or apply the listed mitigation; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2015-2296 being exploited?

CVE-2015-2296 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2015-2296 affect?

CVE-2015-2296 affects mageia, requests, ubuntu linux. Severity is medium (CVSS 6.8). The resolve_redirects function in sessions.py in requests 2.1.0 through 2.5.3 allows remote attackers to conduct session fixation attacks via a cookie without a host value in a redirect.

How urgent is CVE-2015-2296?

Priority 51/100. On your watchlist

Software pages

Python vulnerabilities · Ubuntu vulnerabilities

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References

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