VulnerabilityPublished 13 Aug 2026Updated 1 Nov 2026

CVE-2026-49476: Manim · Soup Sieve has Memory Exhaustion via Large Comma-Separated Selector Lists

Affects manimSource GCVE Database

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Not known to be exploited · CVSS 7.5 High : upgrade to 0.20.1_1 soon.

Data as of 1 Nov 2026, 22:58 UTC

CVSS 3.1 base score

7.5High

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.6% chance of exploitation in 30 days – higher than 50% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 0.20.1_1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
Confidentiality: None: There is no loss of confidentiality within the impacted component.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 13 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 1 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade manim to 0.20.1_1.

Affected software

Product	Affected	Fixed in
Homebrewmanim`pkg:brew/manim`Other threats	Affected >=0.19.0 <0.20.1_1	Fixed in 0.20.1_1

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available in soupsieve version 0.20.1_1 that fixes this vulnerability by addressing the unbounded memory allocation issue. Users and maintainers of affected applications should upgrade to soupsieve 0.20.1_1 or later. No additional mitigation is required if the patch is applied.

Description

A memory exhaustion vulnerability exists in soupsieve, the CSS selector engine used by Beautiful Soup 4, due to unbounded memory allocation when parsing large comma-separated selector lists. An attacker can supply a crafted CSS selector string with many comma-separated items, causing the parser to allocate excessive heap memory and potentially crash or degrade the application. This affects applications that use soupsieve.compile() or Beautiful Soup's .select()/.select_one() methods with user-supplied selectors. The issue is fixed in soupsieve version 0.20.1_1.

Impact

An attacker can cause denial of service by exhausting available memory on servers running Python applications that compile user-supplied CSS selectors using soupsieve. This can result in out-of-memory kills in containerized environments, swap thrashing on physical servers, or process termination due to Python MemoryError exceptions. No authentication or user interaction is required, and the attack scales linearly with the number of selectors. Multiple concurrent requests can amplify the impact. Since soupsieve is a dependency of Beautiful Soup 4, many Python applications that accept CSS selectors from users are potentially affected.

Summary

The soupsieve CSS selector parser allocates memory linearly proportional to the number of comma-separated selectors in a list, with no enforced limit. Each selector object consumes approximately 976 bytes of heap memory. A crafted selector string with 250,000 items (e.g., 'a,a,a,...') of about 500 KB can cause allocation of approximately 244 MB of memory, resulting in a 488x amplification ratio. This can lead to denial of service via memory exhaustion in Python applications using soupsieve or Beautiful Soup 4 that accept user-controlled CSS selectors. The vulnerability affects soupsieve versions >=0.19.0 and <0.20.1_1 and is fixed in 0.20.1_1.

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Exploitation evidence

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Affected software

Description

AI analysisMachine-generated, updated 1 Nov 2026, 20:01 UTC

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