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Claude Mythos Identifies 271 Vulnerabilities in Mozilla’s Firefox

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Claude Mythos Identifies 271 Vulnerabilities in Mozilla’s Firefox

Mozilla shipped Firefox 150 this week with patches for 271 security vulnerabilities discovered by Anthropic’s Claude Mythos Preview in an initial evaluation.

The scan forms part of Project Glasswing, Anthropic’s coordinated defense effort that grants limited Mythos access to critical infrastructure partners.

Mozilla Patches 271 Vulnerabilities After Claude Mythos Evaluation

In a recent blog post, Firefox CTO Bobby Holley explained that browser security has traditionally followed an offense-heavy model.

Under this approach, vendors acknowledged that fully eliminating exploits was unrealistic and instead focused on making attacks so costly or complex that they would not be widely abused.

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“As these capabilities reach the hands of more defenders, many other teams are now experiencing the same vertigo we did when the findings first came into focus. For a hardened target, just one such bug would have been red alert in 2025, and so many at once makes you stop to wonder whether it’s even possible to keep up,” Holley said.

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The executive stated that since February, the Firefox team has been working intensively with advanced AI tools to identify and remediate “latent security vulnerabilities in the browser.” 

Earlier collaboration with Anthropic, using its Opus 4.6 model, led to fixes for 22 security-sensitive issues in Firefox 148.

The latest update represents a sharp escalation in scale, roughly a twelvefold increase, highlighting how AI-driven audits are reshaping modern cybersecurity practices.

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“Encouragingly, we also haven’t seen any bugs that couldn’t have been found by an elite human researcher,’ he added.

Why the Firefox Result Matters for Crypto

The Firefox evaluation lands as exchanges weigh their own exposure to AI-assisted attacks. Anthropic says Mythos can “identify and then exploit zero-day vulnerabilities in every major operating system and every major web browser when directed by a user to do so.” 

This marks the same surface that hot wallets and decentralized applications depend on. While private keys are generally protected within wallet environments, attackers can still gain control over on-chain assets by tricking users into approving harmful transactions or exploiting compromised extensions.

Interest in such capabilities is already expanding. Coinbase has reportedly explored access to Anthropic’s Mythos. This builds on its existing use of Claude models for customer support across more than 100 regions.

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The post Claude Mythos Identifies 271 Vulnerabilities in Mozilla’s Firefox appeared first on BeInCrypto.

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Crypto World

Bitcoin Bull Score Index Rebound Fails to Quash 2022 Bear Market Fears

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Bitcoin Bull Score Index Rebound Fails to Quash 2022 Bear Market Fears

Bitcoin (BTC) price metrics are showing relief this month, but the risk of repeating the 2022 bear market remains.

Key points:

  • Bitcoin’s Bull Score Index combined price metric reaches its highest levels since October last year.

  • The relief may be short-lived, analysis warns, pointing to the 2022 bear market.

  • Crypto sentiment reaches its most bullish since January, per the Crypto Fear & Greed Index.

Bitcoin Bull Score Index ditches “bearish” zone

New data from onchain analytics platform CryptoQuant place the spotlight on the Bitcoin Bull Score Index (BSI).

Bitcoin has finally entered “neutral” territory with its push to $78,000, the latest BSI data confirms, with the Index climbing to its highest since October 2025.

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BSI incorporates nine price metrics to give an overall impression of performance. Since the bear market began, it has been sharply bearish — just as in the early stages of the previous bear market four years ago.

“First time in this bear market that the Bull Score Index enters neutral zone (50),” CryptoQuant contributor Julio Moreno noted in an X post on Wednesday.

Bitcoin Bull Score Index. Source: CryptoQuant

Moreno cautioned that despite the pressure being off for now, BSI also had a brief cooling-off period before the 2022 bear market continued.

“In March 2022, the Bull Score entered neutral territory for about a week, and then the price resumed its decline,” he added.

Should history repeat, attention will be on the Index’s performance into the April monthly close, as BTC/USD attempts to break out of a multi-month range.

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Examining BSI readings last week, with price around $74,000, CryptoQuant contributor Arab Chain described a “balance between supply and demand forces.”

“On the other hand, the current BSI reading shows that the market is still far from the area of strong optimism (above 60), which typically indicates strong bullish conditions, while also remaining above the zone of extreme pessimism (clearly below 40),” they wrote in a “QuickTake” blog post. 

“This places the market in a transitional phase, as investors await new catalysts to determine the next direction.”

Sentiment edges to most bullish since January

Other signs of a broader market recovery come from crypto trader sentiment.

Related: BTC price due new highs: Five things to know in Bitcoin this week

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According to the Crypto Fear & Greed Index, a classic lagging indicator that uses a basket of factors to reflect the mood among investors, conditions are at their least negative since mid-January.

Fear & Greed measured 32/100 on Wednesday — still within its “fear” zone while like BSI also approaching the “neutral” bracket.

The Index value has nearly tripled in a little over a week.

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Crypto Fear & Greed Index (screenshot). Source: Alternative.me